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Article Dans Une Revue Journal of Photochemistry and Photobiology A: Chemistry Année : 2007

Malic acid photocatalytic degradation using a TiO2-coated optical fiber reactor

A. Danion
  • Fonction : Auteur
J. Disdier
  • Fonction : Auteur
N. Jaffrezic-Renault

Résumé

A photoreactor containing a bundle of TiO2-coated optical fibers was employed for the photocatalytic degradation of malic acid, a polycarboxylic acid found in fermentation processes and in biomass. TiO2 film was coated on optical fiber using a dip-coating method. The kinetic behavior of malic acid conversion in this study was found to follow a first-order kinetics with a degradation rate of 6.8 × 10−2 h−1. Laboratory experiments enabled one to detect six intermediates presented in five degradation pathways. Their evolution during the photocatalytic reaction was also investigated. The major one, malonic acid, is initiated by a decarboxylation (“photo-Kolbe”) reaction in the α-position with respect to the OH group followed by an OH addition. The others intermediates come from the same process or from H-abstraction or oxidation. The total organic carbon removal after 20 h of treatment was 21%. A high photonic efficiency of 6% was achieved for experiments operated in the optical fiber photoreactor due to the optimized light utilization.

Dates et versions

hal-00179303 , version 1 (15-10-2007)

Identifiants

Citer

A. Danion, J. Disdier, C. Guillard, N. Jaffrezic-Renault. Malic acid photocatalytic degradation using a TiO2-coated optical fiber reactor. Journal of Photochemistry and Photobiology A: Chemistry, 2007, 190, pp.135-140. ⟨10.1016/j.jphotochem.2007.03.022⟩. ⟨hal-00179303⟩
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